a car travel at 54km/h for first 20 second ,36 km/h for next 30 second and finally 18 km/h for next 10 sec find its average speed
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distance travelled in 20s at 54km/h
=54×20÷60=18km.
distance travelled in 30s at36km/h
=36×30÷60=18km.
distance travelled in 10s at 18km/h
=18×10÷60=3km.
therefore,total distance travelled=18+18+3=39km.
total time=20s+30s+10s=60s=1h.
average speed=
total distance travelled÷total.time taken to travel distance=39km/1h= 39km/h.
therefore,average speed is39km/h.
hope it helps
=54×20÷60=18km.
distance travelled in 30s at36km/h
=36×30÷60=18km.
distance travelled in 10s at 18km/h
=18×10÷60=3km.
therefore,total distance travelled=18+18+3=39km.
total time=20s+30s+10s=60s=1h.
average speed=
total distance travelled÷total.time taken to travel distance=39km/1h= 39km/h.
therefore,average speed is39km/h.
hope it helps
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